I think it's a good first attempt with interesting subjects. ( would love to have the Jeep forward control ) Personally I would correct the lens distortion to start with. If you add a second light source from the side, or change your position while lighting, the shadows behind the rocks and under the cars can be removed.Just my 2 cents.

Good first effort... Dependent upon your taste you can try less peripheral light and more spot like (Cookie-cutter)To add mystery to the subject. Some like to see it all. Others like to think about it. Jim